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Check the Linux distro

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The version of Linux (distro) you are running can be obtained from /etc directory. Eenter the following command at the shell prompt: In...

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There is a good summary of phrases to use when writing journal papers.  English for writing research papers (.pdf file) can be downloade...

Time - What is it?

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Intriguing question related to time are What really time is? Was there time before the Big Bang event? We use motion to measure time....

Why do we use 360 degrees for a complete circle?

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Sumerians, Greeks and Babylonians were the forerunners in observing the astronomical objects, may be for omens initially and later for calc...

Vectors

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What is a vector? In everyday life, we measure things. For example, what is the size of something, what is the volume (how many liters) o...

Symmetry and Emmy Noether's theorem

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Emmy Noether's theorems provide profound relation between a system having symmetry and constancy of a physical quantity. That is, there...

An easy way to find Latex code

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There exists an excellent site on which you can find out the key for most of the $LaTeX$ comments. The site is Detexify Latex handwriting...

Conservation of angular momentum

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It is interesting to see the demo for "Conservation of angular momentum". The MIT2K series has an excellent video on the conserva...

Notes on Fermi-Dirac distribution

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As per my knowledge, in our universe, number of Fermions are more than Bosons (correct me if I am wrong). Apart from this, my interest to w...

Notes on Dark matter and Dark energy

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Dark matter and dark energy are one of the intriguing problems which keep awake theoretical physicists. See this picture for a schematic...